Synthesis and UV-shielding Property of Plate-like Potassium Lithium Titanate Coated with Calcia-doped Ceria Nanoparticles

摘要

In order to attain further performance improvements concerning UV-shielding,the synthesis parameters of plate-like lepidocrocite related potassium lithium titanate were optimized and calcia-doped ceria (Ce0.8Ca0.2O1.8) nanoparticles were coated on plate-like potassium lithium titanate (K0.8Li0.27Ti1.73O4),10-20 mu m in diameter via solution processes,where the plate-like titanate was prepared by reacting K2CO3,Li2CO3 and TiO2 using KCl flux at 950°C.After putting plate-like potassium lithium titanate particles in deionized water at 40°C,appropriate quantities of 3 M NaOH aqueous solution and 0.8 M CeCl3-0.2 M CaCl2 mixed aqueous solution were simultaneously dropped,where the solution was stirred and pH was kept at 12 throughout the reaction.Then,the desired amount of 2 M H2O2 solution was added and pH was also kept at 12.The slurry was filtrated and washed with water and methanol.The precipitate was fired at 700°C for 1 h to obtain plate-like K0.8Li0.27Ti1.73O4 coated with white Ce0.8Ca0.2O1.8 nanoparticles.Such panoscopic assembling successfully improved the comfort of the product when wearing it on the skin without compromising the UV-shielding ability,meanwhile greatly reducing the oxidation catalytic activity.